Plastic pipe bender

Abstract

A plastic pipe bending jig is provided with two offset bending members to fabricate an offset bent pipe. Each bending member is provided with first and second support surfaces, wherein the first support surfaces of each bending member are linearly aligned with each other and the second support surface of each bending member are parallel but offset from each other. The position of the bending members is adjustable so that the pipe offset can be changed as desired.

I claim: 
     
       1. An apparatus for bending heat deformable pipe to a predetermined offset distance comprising: a support member;   a first offset bending member secured to said support member and having first and second surfaces generally configured to support first and second portions of a pipe to be bent, said first and second support surfaces intersecting at a first predetermined bending angle;   a second offset bending member secured to said support member and having third and fourth surfaces generally configured to support third and fourth portions of said pipe to be bent, said third and fourth support surfaces intersecting at a second predetermined bending angle; and   means to adjustably position at least one of said first and second offset bending members at a plurality of predetermined positions on said support member, each of said predetermined positions corresponding to a predetermined offset distance such that at each of said predetermined positions, a portion of said first support surface is linearly aligned with a portion of said third support surface and a portion of said second support surface is parallel to and at a predetermined offset distance from a portion of said fourth support surface.   
     
     
       2. The apparatus as in claim 1 wherein said first predetermined angle equals said second predetermined angle. 
     
     
       3. The apparatus as in claim 1 wherein said support surfaces are grooved surfaces generally complimenting the outer surface of said pipe to be bent. 
     
     
       4. The apparatus as in claim 1 further including a scale to accurately indicate said predetermined offset distances. 
     
     
       5. The apparatus as in claim 1 wherein said adjustable positioning means includes at least one pin extending from at least one of said offset bending members and a plurality of alignment holes positioned in said support member and each corresponding to one of said predetermined distances such that when said pin of said at least one offset bending member is received within a corresponding hole, said portion of said first support surface is linearly aligned with said portion of said third support surface and said portion of said second support surface is parallel to and at one of said predetermined offset distances from said portion of said fourth support surface. 
     
     
       6. The apparatus as in claim 1 wherein said adjustable positioning means includes means to permit said second offset bending member to slide on said support. 
     
     
       7. The apparatus as in claim 1 wherein said adjustable positioning means includes means to slidably secure said second offset bending member along a slot in said support member such that said portion of said first support surface remains linearly aligned with said portion of said third support surface and said portion of said second support surface remains parallel to and offset from said portion of said fourth support surface. 
     
     
       8. The apparatus as in claim 7 wherein said support surfaces are grooved surfaces generally complimenting the outer surface of said pipe to be bent. 
     
     
       9. The apparatus as in claim 8 wherein said first predetermined angle equals said second predetermined angle. 
     
     
       10. The apparatus as in claim 9 further including a scale to indicate said predetermined offset distance. 
     
     
       11. The apparatus as in claim 1 further including an intermediate support secured to said support member and extending between said first and second offset bending members such that a support surface of said intermediate support is generally aligned with said aligned portions of said first and third support surfaces of said first and second bending members, respectively. 
     
     
       12. The apparatus as in claim 9 further including an intermediate support secured to said support member and extending between said first and second offset bending members such that a support surface of said intermediate support is generally aligned with said aligned portions of said first and third support surfaces of said first and second bending members, respectively. 
     
     
       13. An apparatus for bending heat deformable pipe comprising: a support member;   a first offset bending member secured to said support member and having first and second linearly extending surfaces intersecting at a first predetermined bending angle, wherein said first and second extending surfaces support corresponding portions of a pipe to be bent on either side of said first angle;   a second offset bending member secured to said support member and having third and fourth linearly extending surfaces intersecting at a second predetermined bending angle, wherein said third and fourth extending surfaces support corresponding portions of said pipe to be bent on either side of said second angle; and   means to adjustably position at least one of said first and second offset bending members at a plurality of predetermined positions on said support member, each of said predetermined positions corresponding to a desired offset distance such that at each of said predetermined positions, a portion of said first surface is linearly aligned with a portion of said third surface and a portion of said second surface is parallel to and at a desired offset distance from a portion of said fourth surface.